Spindle-bearing



(No Model.)

J KILBURN SPINDLB BEARING.

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UNITED STATES PATENT OFFICE.

1on3 KILBURN, or BELMONT, MASSACHUSETTS.

SPINDLE-BEARING.

SPECIFICATION forming part of Letters Patent No. 590,320, dated September 21, 1897.

Application filed December 2, 1896. Serial No. 614,256. (No model.) 7

To all whom it may concern:

Be it known that 1, JOHN KILBURN, a citizen of the United States, residing at Belmont, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Spindle-Bearings; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In spindles of the self-centering or top type, which are rotated at high speed, it has been found in practice to be desirable to have a certain amount of friction between the spindle and its bolster to insure a smooth and even running of the spindle. It has further been found to be of the greatest advantage that the amount of friction between the bolster and spindle be kept as nearly as practical constant and not increased by the wear of parts. As spindles of this type have been commonly heretofore constructed they are provided with a tapered pintle fitted to correspondingly-shaped hearings in a bolster, and it has been heretofore proposed in the artas, for example, in the patent. to Draper, No. 507,355, dated October 24, 1893 to provide a spring which supports the bolster and acts to hold it up to its fit on the spindle-pintle,but such arrangement has been heretofore, in so far as I am advised of the art, found to be impracticable, for the reason that no means has been heretofore provided whereby the tension of the spring could be regulated, the construction of the device being such that a spring must be selected and inserted therein which will give the required upward effort. It will be evident to one skilled in the art that if the bolster is forced upward with too great a pressure the spindle will turn with too great friction'in its bearings and that if the bolster is not held up with sufficient force to keep it to its fit the spindle will run unevenly, and it will be also evident that to secure the required upward pressure for a successful operation of the device the elastic force exerted by the spring must be accurately determined, and when the difference in the elastic force of springs formed of the samesized wire is taken into consideration it will spring will be further compressed and to maintain a uniform pressure upon the bolster must be adjustedto provide for the change in the relative position of parts.

The object of the present invention is to obviate the difficulties above noted and to generally improve the form and arrangement of spindle-bearings of this class, and to such end the present invention consists of the devices and combinations of'devices as hereinafter described and claimed.

The present invention is illustrated in the accompanying drawings, wherein Figure 1 shows a central vertical section through a spindle-bearing, the lower portion of the spindle and other parts being shown in elevation. Fig. 2 is a similar view of a modified form of the invention.

In the drawings, A represents the spindle, which carries the usual sleeve-whirl B and has the usual tapered end or pintle at below jected through a similarly-shaped opening e in the bottom of the bolster O and forming a step or bearing for the end of the spindlepintle a. The pintle F is restrained from rotation with the spindle and by its connection with the bolster O prevents the rotation of the bolster. Any suitable means may be employed to restrain the rotation of the pintle F, such as providing it with an end f of polygonal shape in cross-section, or any suitable shape other than round, which engages a similarly-shaped recess cl in the bottom of the bolster-case D.

The bolster O is free to reciprocate along the pintle F and its lower end rests upon a quired position on the pintle F so that the spring G, when the bolster O is placed thereon and the spindle placed in the bolster and rotated at the required speed',will be sufficiently compressed to exert the required upward effort to properly hold the bolster to its fit.

As shown in Fig. 1, the block H has a threaded aperture,which engages athreaded portion 1 f of the pintle F, the block in this form havinga recess 71., in which is seated the lower end of the coiled spring G, and to prevent acci dental turning of the block H upon the pintle F it is provided with a vertical groove 71?, which is engaged by a pin h driven into the bolster-case D. As shown in Fig. 2, the pintle F has a smooth cylindrical portion f and the block'H is connected thereto by a driving fit in such amanner that it may be driven to different positions along said pintle.

In practice I find that the best results are secured when the upward effort exerted by the spring G is equal to or slightly greater than the weight of the bolster C, but with my improved arrangement one skilled in the art can readily and quickly adjust the spring G to secure the most successful results under any required conditions.

When the pintle Ct becomes; so far worn or so far wears into the step that the spring G is sufliciently compressed to exert too great an upward thrust, the spring G may be adjusted by moving the block H (or H)-along thepintle F to provide for the change in the relative position of the parts.

Having thus described my invention, I desire to say that Ido not Wish to limit the same to the details of construction herein shown and described; but

I claim as novel and desire to secure by Letters Patent of the United Statesl. The combination with a spindle and its bolster, of a spring arranged to hold the bolster to its fit'on the spindle, and a verticallytially as described.

2. The combination with a spindle and its bolster, of a step-pintle along which the bolster is free to reciprocate, and which is provided with a threaded portion, a groovedblock engaging the threaded portion of the pintle, and a spring interposed between the block and the bolster, substantially as described.

3. The combination with a spindle, its bolster,and bolster-case, of a step restrained from rotation but free to reciprocatein' the bolster, a spring supporting the bolster, and a recess in the base of the bolster engaging the step to hold the bolster from rotation, substantially as described.

4. The combination with a spindle, it'sbofster and bolster-case of a spring supporting the bolster, a recess formed in the base-of bolster, a recess formed in the base of the adjustable support for thespring, substan- 5o bolster-case, a step-pintle along which the bolster is free toreciprocate engaging therecesses in the bolster and its case, and acting torestrain' the bolster from rota-tion,substantially as described.

5. The combination with a spring-support ,75

ed bolster provided with a recess inits base, of a step along which the bolster is free toreciprocate, said step engaging a recess in the base of the bolster to prevent rotation of the bolster, substantially as described.

6. The combination with aspring-supported bolster, of a loosely-held step-pintle I totip laterally in all directions, projected inte the bolster and supporting the spindle, substantially as described.

7. The combination with a bolster, of I spring supporting the bolster, aloosely-he ld step-pintle free totip laterally in all dire!- tions, projected into the bolster and supportcarried by the pintle, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN KILB URN. Witnesses:

A. E. WHYTE, A. O. ORNE.

, ingthe spindle, and asupport for said spring 96 

